Drilling head for oil-well casings



Feb. 27, 1923. 1,446,789.

L. D. D ODD-. DRILLING HEAD FOR OIL WELL CASINGS,

FILED APR. 1. 1922.

0- 0 I fi A5 j Lou/ELL, YD D000 INVENTOR.

Patented Feb. 27, 1923.

ire t an RI I G nnenron OIL-WELL casines.

' 'err i eti i ness-t To all whom it may concern:

Be it known that I, LovnLL D. Donn, citizen of the United States, residing at Franklin, in the county of Venango and S tate of Pennsylvania, have invented certain new and useful Improvements in Drilling Heads for OiLlV ell Casings, of which the following is a specification.

' The object, construction and appl cation of my improved drilling head for 011 well casing are herein set forth with sufiiclent clearness to enable others skilled in the arts to which its construction and use respectively relate, to make and use the same.

In the operation of drilling oil wells, as the drilling operation progresses, casing 18 inserted into the drill hole to shut out the water which would otherwise flood the well and it is expedient that the top of each run of easing that is inserted should be flush with the upper surface of the derrick floor when the drilling is resumed and continues.

As the casing. is being inserted into the well, the regular commercial lengths are usually employed, and these lengths may vary somewhat, and sometimes this variation is considerable, hence it is frequently not possible to cause the upper end of the well casing proper to be flush with the upper surface of the floor of the derrick, but it is always possible to select a section of such length that its upper end, when inserted in the well will be below the upper surface of the floor of the derrick. In this case my improved drilling head is attached to the upper end of said well casing, and by reason of the adjustable, telescoping section, the upper end thereof may be easily and quickly adJusted to a position which coincides with the upper surface of the floor of the derrick, and secured, by means provided for that purpose, in said position.

In the drawings,

Fig. 1 is a longitudinal section proved drilling head, and

Fig. 2 is an elevation thereof in an extended position.

The construction of my improved drilling head for oil well casing is substantially as follows, and for the purpose of thisdescription, certain sizes of casing will be specifically designated, merely for the purpose of illustration, but in no way as contemplating a limitation of the embodiment of my invention, since a drilling head'may be formed of any two consecutive sizes whether they are of my ima ae i seam e e' r ifi all'y me i ne pr. any other i we llssa nsi madam. ie ie a fie in; diameter from two inches to: fifteen and onehal'finches." i

'l/Ve will assume that a fiveandfive-eighths 4 9 s ems .isb'ei s inserte th T mes m ter.sena eare diameter-bf game:

' Und rt issumnt n, abat s lect th coupling 1 will' bea standard coupling for a five and five-eighths casing. The outside diameter of a five and five-eighths casing is six inches. For the outer shell 2 of my drilling head, asection of six and one-quarter inch casing will be used, and for the inner shell 3' of said head, a section of five and V V five-e-ighths casing will be utilized, the lower end of the outer shell 2is swedged down to screw into said coupling 1. However, in lieu of this particular construction a special coupling might be employed.

The upper end of said inner, telescoping shell 3 is supplied with a terminal 4 which is rigidly attached thereto, and consists of a ring of high carbon steel which is preferably tempered to a degree of hardness whichwill best enable it to withstand wear, shocks,

blows, and other use and abuse which is characteristic of work-that is being done around drilling oil wells.

Said inner shell 3 is freely movable longitudinally within said outer shell 2.

For the purpose of securing said inner shell at various positions of said longitudinal movement, or vertical adjustment, set screws, as 5, are inserted through said outer shell 2; said set screws'are preferably of the cone-point, socket or safety type, and seats are formed in the periphery of the inner shell for the reception of the points of said screws, said seats being indicated at 6 in Fig.

2, a section of same being shown in Fig. 1.

From the above description, it will be readily understood that, when the top of the derrick floor, my improved drilling head may be attached to said casing and the member 3 adjusted vertically so as to'position its upper end flush with the derrick floor, and said The use of my improved drilling head for I well casing proper is positioned below the I casing, is conducive to a considerable saving of time, expense, and casing, and may be re- 2 garded as a permanent piece of equipment for drilling oil Wells, to be used and re-used for the drilling of many Wells.

I claim the following:

1. A drilling-head for oil Well casing comprising 1n comblnation, a casing coupling and consisting of a section of casing of the.

sa ne'diameter as said Well casing, securing means adapted to secure said inner shell at various positions of said telescopic movement, and a terminal for theupper end of said inner, telescoping section comprising a ring of high-carbon steel.

2. A drilling-head for oil Well casing comprising in combination, a casing coupling suitable for connection to the Well casing, an outer shell consisting of a section of casing of larger diameter than said Well casing carried by said coupling, an inner shell consisting of a section of casing of the same diameter as said Well casing arranged to be longitudinally adjustable Within" said outer section, securing meanscarried by said outer shell'adapted to secure said inner shell in Various positions of adjustment,'and a terminal for the upper end of said inner section, comprising a ring of hardened steel. In testimony whereof I afiix my signature.

LOVELL D. DODD. 

